/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench/fermat2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 12:18:45,530 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:18:45,532 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:18:45,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:18:45,544 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:18:45,545 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:18:45,546 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:18:45,548 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:18:45,550 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:18:45,550 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:18:45,551 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:18:45,552 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:18:45,553 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:18:45,554 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:18:45,555 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:18:45,556 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:18:45,556 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:18:45,557 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:18:45,559 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:18:45,561 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:18:45,562 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:18:45,563 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:18:45,564 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:18:45,565 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:18:45,567 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 12:18:45,577 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:18:45,578 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:18:45,579 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:18:45,580 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 12:18:45,604 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:18:45,605 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:18:45,607 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:18:45,607 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:18:45,607 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:18:45,607 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:18:45,607 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:18:45,608 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:18:45,608 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:18:45,608 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:18:45,609 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:18:45,609 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:18:45,609 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:18:45,610 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:18:45,610 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:18:45,610 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:18:45,610 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:18:45,610 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:18:45,611 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:18:45,611 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:18:45,611 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:18:45,611 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:18:45,612 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:18:45,612 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:18:45,612 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:18:45,612 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:18:45,612 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:18:45,612 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:18:45,613 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:18:45,613 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 12:18:45,856 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:18:45,872 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:18:45,877 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:18:45,878 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:18:45,879 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:18:45,879 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/fermat2.c [2020-07-20 12:18:45,965 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3debf5aa1/be46af1980a54b489af0287a7325261c/FLAGde06683e3 [2020-07-20 12:18:46,403 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:18:46,403 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/fermat2.c [2020-07-20 12:18:46,408 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3debf5aa1/be46af1980a54b489af0287a7325261c/FLAGde06683e3 [2020-07-20 12:18:46,791 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3debf5aa1/be46af1980a54b489af0287a7325261c [2020-07-20 12:18:46,801 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:18:46,804 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:18:46,805 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:18:46,806 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:18:46,809 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:18:46,810 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:18:46" (1/1) ... [2020-07-20 12:18:46,813 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@431993b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:46, skipping insertion in model container [2020-07-20 12:18:46,813 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:18:46" (1/1) ... [2020-07-20 12:18:46,820 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:18:46,837 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:18:47,040 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:18:47,043 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:18:47,062 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:18:47,077 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:18:47,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47 WrapperNode [2020-07-20 12:18:47,078 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:18:47,079 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:18:47,079 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:18:47,079 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:18:47,089 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (1/1) ... [2020-07-20 12:18:47,090 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (1/1) ... [2020-07-20 12:18:47,166 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (1/1) ... [2020-07-20 12:18:47,167 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (1/1) ... [2020-07-20 12:18:47,176 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (1/1) ... [2020-07-20 12:18:47,180 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (1/1) ... [2020-07-20 12:18:47,181 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (1/1) ... [2020-07-20 12:18:47,182 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:18:47,183 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:18:47,183 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:18:47,183 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:18:47,184 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:18:47,244 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:18:47,245 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:18:47,245 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 12:18:47,245 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 12:18:47,245 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:18:47,245 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:18:47,245 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_double [2020-07-20 12:18:47,246 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 12:18:47,246 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 12:18:47,246 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 12:18:47,246 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:18:47,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:18:47,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:18:47,474 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:18:47,474 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 12:18:47,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:18:47 BoogieIcfgContainer [2020-07-20 12:18:47,482 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:18:47,487 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:18:47,487 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:18:47,493 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:18:47,493 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:18:46" (1/3) ... [2020-07-20 12:18:47,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c99fc7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:18:47, skipping insertion in model container [2020-07-20 12:18:47,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:18:47" (2/3) ... [2020-07-20 12:18:47,498 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c99fc7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:18:47, skipping insertion in model container [2020-07-20 12:18:47,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:18:47" (3/3) ... [2020-07-20 12:18:47,500 INFO L109 eAbstractionObserver]: Analyzing ICFG fermat2.c [2020-07-20 12:18:47,512 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:18:47,519 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 12:18:47,536 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 12:18:47,561 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:18:47,562 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:18:47,562 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:18:47,562 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:18:47,562 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:18:47,562 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:18:47,562 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:18:47,562 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:18:47,578 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 12:18:47,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 12:18:47,582 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:18:47,583 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:18:47,583 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:18:47,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:18:47,588 INFO L82 PathProgramCache]: Analyzing trace with hash -849943384, now seen corresponding path program 1 times [2020-07-20 12:18:47,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:18:47,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902945379] [2020-07-20 12:18:47,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:18:47,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:18:47,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 12:18:47,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:18:47,680 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 12:18:47,680 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:18:47,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902945379] [2020-07-20 12:18:47,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:18:47,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 12:18:47,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403089344] [2020-07-20 12:18:47,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 12:18:47,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:18:47,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 12:18:47,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 12:18:47,701 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-07-20 12:18:47,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:18:47,726 INFO L93 Difference]: Finished difference Result 50 states and 67 transitions. [2020-07-20 12:18:47,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 12:18:47,727 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-20 12:18:47,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:18:47,736 INFO L225 Difference]: With dead ends: 50 [2020-07-20 12:18:47,736 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 12:18:47,739 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 12:18:47,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 12:18:47,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 12:18:47,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 12:18:47,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-07-20 12:18:47,775 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 21 [2020-07-20 12:18:47,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:18:47,776 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-07-20 12:18:47,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 12:18:47,776 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-07-20 12:18:47,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 12:18:47,778 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:18:47,779 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:18:47,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:18:47,993 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:18:47,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:18:47,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1193991140, now seen corresponding path program 1 times [2020-07-20 12:18:47,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:18:47,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916095919] [2020-07-20 12:18:47,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:18:48,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:18:48,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 12:18:48,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:18:48,114 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:19:01,116 WARN L193 SmtUtils]: Spent 8.25 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 12:19:01,121 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:19:18,565 WARN L193 SmtUtils]: Spent 10.81 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 12:19:20,613 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:19:28,835 WARN L838 $PredicateComparison]: unable to prove that (exists ((v_main_~u~0_BEFORE_CALL_1 Int)) (and (not (= (+ (* 2 v_main_~u~0_BEFORE_CALL_1) (* 4 (let ((.cse0 (div (+ (* v_main_~u~0_BEFORE_CALL_1 (- 1)) 1) (- 2)))) (* .cse0 .cse0)))) (+ (* v_main_~u~0_BEFORE_CALL_1 v_main_~u~0_BEFORE_CALL_1) 1))) (= 0 (mod (+ v_main_~u~0_BEFORE_CALL_1 1) (- 2))))) is different from false [2020-07-20 12:19:30,860 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_main_~u~0_BEFORE_CALL_1 Int)) (and (not (= (+ (* 2 v_main_~u~0_BEFORE_CALL_1) (* 4 (let ((.cse0 (div (+ (* v_main_~u~0_BEFORE_CALL_1 (- 1)) 1) (- 2)))) (* .cse0 .cse0)))) (+ (* v_main_~u~0_BEFORE_CALL_1 v_main_~u~0_BEFORE_CALL_1) 1))) (= 0 (mod (+ v_main_~u~0_BEFORE_CALL_1 1) (- 2))))) is different from true [2020-07-20 12:19:30,868 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:19:30,869 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:19:30,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916095919] [2020-07-20 12:19:30,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:19:30,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 12:19:30,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875161078] [2020-07-20 12:19:30,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 12:19:30,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:19:30,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 12:19:30,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=13, Unknown=2, NotChecked=6, Total=30 [2020-07-20 12:19:30,872 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 6 states. [2020-07-20 12:20:01,371 WARN L193 SmtUtils]: Spent 29.96 s on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 12:20:10,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:20:10,037 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-20 12:20:10,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 12:20:10,048 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-07-20 12:20:10,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:20:10,050 INFO L225 Difference]: With dead ends: 34 [2020-07-20 12:20:10,050 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 12:20:10,051 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.5s TimeCoverageRelationStatistics Valid=13, Invalid=19, Unknown=2, NotChecked=8, Total=42 [2020-07-20 12:20:10,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 12:20:10,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2020-07-20 12:20:10,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 12:20:10,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 12:20:10,067 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 21 [2020-07-20 12:20:10,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:20:10,072 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 12:20:10,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 12:20:10,072 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 12:20:10,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 12:20:10,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:20:10,075 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:20:10,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:20:10,280 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:20:10,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:20:10,281 INFO L82 PathProgramCache]: Analyzing trace with hash -1415100442, now seen corresponding path program 1 times [2020-07-20 12:20:10,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:20:10,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2136853493] [2020-07-20 12:20:10,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:20:10,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:20:10,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 12:20:10,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:20:10,417 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:20:10,772 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:20:10,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:20:10,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:20:11,013 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 12:20:11,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:20:11,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:20:11,161 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:20:11,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2136853493] [2020-07-20 12:20:11,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:20:11,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-20 12:20:11,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677256607] [2020-07-20 12:20:11,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 12:20:11,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:20:11,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 12:20:11,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-20 12:20:11,165 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 10 states. [2020-07-20 12:20:17,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:20:17,727 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2020-07-20 12:20:17,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 12:20:17,729 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 12:20:17,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:20:17,732 INFO L225 Difference]: With dead ends: 35 [2020-07-20 12:20:17,732 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 12:20:17,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2020-07-20 12:20:17,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 12:20:17,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 12:20:17,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 12:20:17,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-20 12:20:17,740 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 27 [2020-07-20 12:20:17,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:20:17,741 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-20 12:20:17,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 12:20:17,741 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-20 12:20:17,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 12:20:17,742 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:20:17,742 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:20:17,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:20:17,957 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:20:17,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:20:17,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1831429119, now seen corresponding path program 1 times [2020-07-20 12:20:17,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:20:17,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900152463] [2020-07-20 12:20:17,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:20:17,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:20:17,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 12:20:17,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:20:18,385 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 12:20:18,399 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 12:20:22,769 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:20:22,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:20:22,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:20:25,252 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 12:20:25,301 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 12:20:25,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:20:25,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:20:25,468 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:20:25,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900152463] [2020-07-20 12:20:25,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:20:25,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2020-07-20 12:20:25,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198142487] [2020-07-20 12:20:25,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 12:20:25,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:20:25,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 12:20:25,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=83, Unknown=1, NotChecked=0, Total=110 [2020-07-20 12:20:25,470 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 11 states. [2020-07-20 12:20:38,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:20:38,558 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2020-07-20 12:20:38,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 12:20:38,566 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-07-20 12:20:38,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:20:38,567 INFO L225 Difference]: With dead ends: 44 [2020-07-20 12:20:38,567 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 12:20:38,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=39, Invalid=116, Unknown=1, NotChecked=0, Total=156 [2020-07-20 12:20:38,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 12:20:38,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 28. [2020-07-20 12:20:38,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 12:20:38,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-20 12:20:38,577 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 29 [2020-07-20 12:20:38,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:20:38,577 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-20 12:20:38,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 12:20:38,577 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-20 12:20:38,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-20 12:20:38,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:20:38,578 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:20:38,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:20:38,793 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:20:38,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:20:38,794 INFO L82 PathProgramCache]: Analyzing trace with hash -1774170817, now seen corresponding path program 1 times [2020-07-20 12:20:38,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:20:38,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81523880] [2020-07-20 12:20:38,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:20:38,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:20:38,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 12:20:38,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:20:49,647 WARN L193 SmtUtils]: Spent 8.46 s on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 12:21:04,467 WARN L193 SmtUtils]: Spent 6.46 s on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 12:21:04,474 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 12:21:04,698 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 1 refuted. 2 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:21:04,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 12:21:04,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:21:10,071 INFO L320 QuantifierPusher]: Applying distributivity to a DISJUNCTION[2, 2, 2, 1] term [2020-07-20 12:21:10,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:21:10,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 12:21:11,091 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 12:21:11,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81523880] [2020-07-20 12:21:11,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 12:21:11,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2020-07-20 12:21:11,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097339963] [2020-07-20 12:21:11,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 12:21:11,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:21:11,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 12:21:11,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=78, Unknown=6, NotChecked=0, Total=110 [2020-07-20 12:21:11,094 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 11 states. [2020-07-20 12:21:39,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:21:39,351 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2020-07-20 12:21:39,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 12:21:39,352 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-07-20 12:21:39,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:21:39,352 INFO L225 Difference]: With dead ends: 42 [2020-07-20 12:21:39,352 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 12:21:39,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=39, Invalid=111, Unknown=6, NotChecked=0, Total=156 [2020-07-20 12:21:39,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 12:21:39,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 12:21:39,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 12:21:39,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 12:21:39,355 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2020-07-20 12:21:39,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:21:39,355 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 12:21:39,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 12:21:39,355 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 12:21:39,355 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 12:21:39,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:21:39,566 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 12:22:05,990 WARN L193 SmtUtils]: Spent 26.32 s on a formula simplification. DAG size of input: 50 DAG size of output: 31 [2020-07-20 12:22:08,077 WARN L193 SmtUtils]: Spent 2.06 s on a formula simplification. DAG size of input: 35 DAG size of output: 1 [2020-07-20 12:22:32,362 WARN L193 SmtUtils]: Spent 24.28 s on a formula simplification. DAG size of input: 50 DAG size of output: 31 [2020-07-20 12:22:32,365 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 12:22:32,365 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 12:22:32,365 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 12:22:32,365 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 12:22:32,366 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 12:22:32,366 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 12:22:32,366 INFO L271 CegarLoopResult]: At program point assume_abort_if_notENTRY(lines 6 8) the Hoare annotation is: true [2020-07-20 12:22:32,366 INFO L268 CegarLoopResult]: For program point L7(line 7) no Hoare annotation was computed. [2020-07-20 12:22:32,366 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 8) no Hoare annotation was computed. [2020-07-20 12:22:32,366 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 6 8) no Hoare annotation was computed. [2020-07-20 12:22:32,366 INFO L264 CegarLoopResult]: At program point L35-2(lines 31 42) the Hoare annotation is: (or (and (= 1 main_~v~0) (= (let ((.cse0 (div (+ (* main_~u~0 (- 1)) 1) (- 2)))) (* .cse0 .cse0)) (+ main_~A~0 main_~r~0)) (= 0 (mod (+ main_~u~0 1) (- 2)))) (= (+ (* main_~v~0 main_~v~0) (* main_~A~0 4) (* main_~r~0 4) (* main_~u~0 2)) (+ (* main_~v~0 2) (* main_~u~0 main_~u~0)))) [2020-07-20 12:22:32,366 INFO L264 CegarLoopResult]: At program point L31-2(lines 31 42) the Hoare annotation is: (let ((.cse0 (+ (* main_~u~0 main_~u~0) (* 2 main_~v~0))) (.cse1 (* main_~v~0 main_~v~0)) (.cse2 (* 2 main_~u~0)) (.cse3 (* 4 main_~A~0))) (and (= .cse0 (+ .cse1 .cse2 .cse3)) (= .cse0 (+ .cse1 .cse2 (* 4 main_~r~0) .cse3)))) [2020-07-20 12:22:32,366 INFO L268 CegarLoopResult]: For program point L25(line 25) no Hoare annotation was computed. [2020-07-20 12:22:32,367 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 47) no Hoare annotation was computed. [2020-07-20 12:22:32,367 INFO L271 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: true [2020-07-20 12:22:32,367 INFO L271 CegarLoopResult]: At program point L23-1(line 23) the Hoare annotation is: true [2020-07-20 12:22:32,367 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 17 47) no Hoare annotation was computed. [2020-07-20 12:22:32,367 INFO L264 CegarLoopResult]: At program point L32(line 32) the Hoare annotation is: (or (and (= 1 main_~v~0) (= (let ((.cse0 (div (+ (* main_~u~0 (- 1)) 1) (- 2)))) (* .cse0 .cse0)) (+ main_~A~0 main_~r~0)) (= 0 (mod (+ main_~u~0 1) (- 2)))) (= (+ (* main_~v~0 main_~v~0) (* main_~A~0 4) (* main_~r~0 4) (* main_~u~0 2)) (+ (* main_~v~0 2) (* main_~u~0 main_~u~0)))) [2020-07-20 12:22:32,367 INFO L268 CegarLoopResult]: For program point L32-1(lines 31 42) no Hoare annotation was computed. [2020-07-20 12:22:32,367 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 17 47) the Hoare annotation is: true [2020-07-20 12:22:32,368 INFO L268 CegarLoopResult]: For program point L45(line 45) no Hoare annotation was computed. [2020-07-20 12:22:32,368 INFO L268 CegarLoopResult]: For program point L35(lines 35 41) no Hoare annotation was computed. [2020-07-20 12:22:32,368 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 9 15) the Hoare annotation is: true [2020-07-20 12:22:32,368 INFO L268 CegarLoopResult]: For program point L11(lines 11 12) no Hoare annotation was computed. [2020-07-20 12:22:32,368 INFO L268 CegarLoopResult]: For program point L10(lines 10 13) no Hoare annotation was computed. [2020-07-20 12:22:32,368 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 9 15) no Hoare annotation was computed. [2020-07-20 12:22:32,368 INFO L268 CegarLoopResult]: For program point L10-2(lines 9 15) no Hoare annotation was computed. [2020-07-20 12:22:32,368 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2020-07-20 12:22:32,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 12:22:32 BoogieIcfgContainer [2020-07-20 12:22:32,383 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 12:22:32,385 INFO L168 Benchmark]: Toolchain (without parser) took 225582.51 ms. Allocated memory was 138.9 MB in the beginning and 243.8 MB in the end (delta: 104.9 MB). Free memory was 103.5 MB in the beginning and 182.6 MB in the end (delta: -79.0 MB). Peak memory consumption was 25.8 MB. Max. memory is 7.1 GB. [2020-07-20 12:22:32,386 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 138.9 MB. Free memory is still 121.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 12:22:32,387 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.34 ms. Allocated memory is still 138.9 MB. Free memory was 103.1 MB in the beginning and 93.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-20 12:22:32,388 INFO L168 Benchmark]: Boogie Preprocessor took 103.42 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 93.3 MB in the beginning and 180.9 MB in the end (delta: -87.6 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-20 12:22:32,388 INFO L168 Benchmark]: RCFGBuilder took 299.39 ms. Allocated memory is still 202.4 MB. Free memory was 180.9 MB in the beginning and 167.2 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. [2020-07-20 12:22:32,389 INFO L168 Benchmark]: TraceAbstraction took 224896.27 ms. Allocated memory was 202.4 MB in the beginning and 243.8 MB in the end (delta: 41.4 MB). Free memory was 166.2 MB in the beginning and 182.6 MB in the end (delta: -16.4 MB). Peak memory consumption was 25.1 MB. Max. memory is 7.1 GB. [2020-07-20 12:22:32,393 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 138.9 MB. Free memory is still 121.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 273.34 ms. Allocated memory is still 138.9 MB. Free memory was 103.1 MB in the beginning and 93.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 103.42 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 93.3 MB in the beginning and 180.9 MB in the end (delta: -87.6 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 299.39 ms. Allocated memory is still 202.4 MB. Free memory was 180.9 MB in the beginning and 167.2 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 224896.27 ms. Allocated memory was 202.4 MB in the beginning and 243.8 MB in the end (delta: 41.4 MB). Free memory was 166.2 MB in the beginning and 182.6 MB in the end (delta: -16.4 MB). Peak memory consumption was 25.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 31]: Loop Invariant Derived loop invariant: ((1 == v && (u * -1 + 1) / -2 * ((u * -1 + 1) / -2) == A + r) && 0 == (u + 1) % -2) || v * v + A * 4 + r * 4 + u * 2 == v * 2 + u * u - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 172.0s, OverallIterations: 5, TraceHistogramMax: 2, AutomataDifference: 87.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 52.8s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 113 SDtfs, 44 SDslu, 364 SDs, 0 SdLazy, 255 SolverSat, 10 SolverUnsat, 26 SolverUnknown, 0 SolverNotchecked, 54.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 215 GetRequests, 167 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 90.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 17 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 20 PreInvPairs, 32 NumberOfFragments, 152 HoareAnnotationTreeSize, 20 FomulaSimplifications, 434 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 11 FomulaSimplificationsInter, 261 FormulaSimplificationTreeSizeReductionInter, 52.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 83.4s InterpolantComputationTime, 127 NumberOfCodeBlocks, 127 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 204 ConstructedInterpolants, 3 QuantifiedInterpolants, 28290 SizeOfPredicates, 21 NumberOfNonLiveVariables, 268 ConjunctsInSsa, 52 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 42/52 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...